the fbi said its searching his computer for evidence. >>> a 14-year-old was arrested on thursday for a similar alleged plot in visalia and tulare county. the school district said he threatened to shoot up mount whitney high school. investigators believe it was part of a gang initiatation. he is being charged with making terrorist threats and gang enhancement. the schools have increased security. >> the nra has called for armed guards in every school but many districts say those officers are already there. oakland, san francisco, san jose all have armed police. it costs about $5 million for 20 armed officers and 80 site supervisors. >> we have taken the approach but it's at a cost. it comes at a steep cost. when you talk about loss of supporting programs through music, the arts. >> the officials say they couldn't pay to expand the security program to all 50 schools. >> instead of paying armed officers, some people think teachers should be the one with the guns. a store in little rock arkansas is now offering free gun training classes to teachers. more than 50 people have signed up. te